The
magician removes a black wallet from his pocket and opens on the
table. On one side of the wallet is an envelope and on the other are
five small ESP cards. The spectator can choose any symbol they
like. They may change their mind as many times as they choose, no
force is involved. Once the card has been decided on the magician opens
the envelope and one card falls out -- it's a perfect match!

This is a very clever and clean effect. The symbol is different every time and there is no force of any kind!